P1D9E Diagnostic Trouble Code

P1D9E is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P1D9E diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Dirty air cleaner element Damaged DPF
A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P1D9E is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P1D9E.

Fortunately, P1D9E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1D9E Trouble Code For Specific Cars

P1D9E Oldsmobile Intrigue Cylinder head over temp sensed
P1D9E Mahindra Scorpio Traction Control Valve RF Circuit Open
P1D9E Skoda 105 IP Power Sliding Door Open/Close switch Ckt Short to Gnd
P1D9E Opel Vivaro Door Lock Cylinder Circuit Failure
P1D9E Healey Alvis Passenger Solar Radiation Sensor Circuit Short to Ground
P1D9E Fiat Vivace Left Power Sliding Door Open/Close Output Circuit Short to Battery
P1D9E Audi Rs6 ASM Mode Circuit Low